Rosemount CT4215, Reference Manual

Page: 52 / 56

Possible Problems and Solutions
(continued)
Table 8-1:
Fault symptom Order of troubleshooting Action or item to be replaced
Maintenance alarm on LDM. If the pulse is below the LASER warn-
ing threshold, consider purging the
cell with compressed air.
Note
The system will still be healthy.
Purge the cell.
Consider cleaning the cell mirrors
soon when pulse is below threshold. Clean the mirrors.
Laser unhealthy. If the pulse is below the laser thresh-
old, clean the cell mirrors. Clean the mirrors.
Check the laser beam path for ob-
structions. Clear any obstructions from the laser
beam path.
System unhealthy. If the pulse is below the laser thresh-
old, clean the cell mirrors. Clean the mirrors.
Check the laser beam path for ob-
structions. Clear any obstructions from the laser
beam path.
If the system has rejected n consecu-
tive rejects, press the Reset alarms
button on LDM.
Press the Reset button (see
Section 6.3 ).
If the IN/OUT count does not match,
reset the counters. Reset the counters.
AIR warning light illuminated. Check the blower isolator is in the
ON
position and the blower status bulb is
illuminated.
Switch the isolator
ON
.
Check the compressed air supply is
open. Turn on the air.
Check the compressed air supply pres-
sure is within the specified range of
the pressure switch (0.3 - 0.5 MPa).
Pressure switch should be green. Confirm the supply pressure. (See
Section 2.4 for location of the pressure
regulator).
Traffic light is red and does not reset
to green when Reset pressed. Check if the LDM dasboard is green. Repeat the rows Laser unheathy and
System unhealthy above.
Check if the AIR warning light is illumi-
nated. Repeat the row AIR warning light illu-
minated above.
System is not counting packs. Check the INPUT gate cable is attach-
ed at both ends: control system and
light gate. Attach the cable (do not hot plug if
loose).
Troubleshooting and diagnostics
40 Rosemount CT4215